Building on Ohio_native's input: edit /etc/environment so the TZ variable setting is
TZ=PST8PDT7,M3.2.0,M11.1.0

This has the effect of changing to daylight time on the second sunday in March with a one hour forward step at the default time of 2am and stepping back on the first Sunday in November by one hour at the default hour of 2 am.

And be careful when you use NIM. If you run 'nimclient -d' from a NIM client LPAR, it will change the date AND TIMEZONE of the client in accordance to the NIM master.
I got my fingers burned a long time ago, as man pages never got updated to say TIMEZONE AS WELL?

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